Bioavailability of Vitamin D Encapsulated in Casein Micelles, Compared to Its Bioavailability in a Synthetic Emulsifier Currently Used for Supplementation and Enrichment. (VD)

Rambam Health Care Campus

Status: Unknown

Conditions: Vitamin D Deficiency

Treatments: Dietary Supplement: Placebo: un-enriched skimmilk.; Dietary Supplement: enriched skimmilk with VD; Dietary Supplement: Skimmilk enriched with VD wherein the VD will be emulsified using Tween 80

Study type: Interventional

Funder types: Other

Identifiers

NCT01807845

No. 1-Version 1.

Details and patient eligibility

About

Background: Vitamin D3 (VD) is an oil soluble vitamin formed in the skin during exposure to UV light. It is essential for bone and calcium metabolism, insulin reactivity, immune system etc. The dietary sources of VD are scarce, and insufficient. Epidemiological studies link proper VD status with lower risks of bone fracture, hypertension, diabetes, cancer and more. VD deficiency is widespread, mainly due to avoidance of sun exposure due to fear of melanoma. Therefore there is an urgent need to enrich staple foods & beverages with VD, to prevent deficiency.

A novel technology was developed , for nanoencapsulating VD within casein micelles (CM) (natural milk protein nanoparticles). Previously we have found that the bioavailability of VD in CM in 1% fat milk was similar to that in an aqueous dietary supplement based on a synthetic emulsifier- Tween 80- which is sometimes used by the industry to add VD into milk.

The main research question studied in the current project is: how will the bioavailability of VD be affected by its delivery in CM compared to its delivery using Tween 80 in a fat free milk product, like nonfat yogurt.

Hypothesis: The open molecular structure of caseins, which evolved to be easily digestible, may facilitate the bioavailability of VD nanoencapsulated in CM, so that it will not be less than that in Tween 80, which is considered to be good. CM are particularly useful for oil-soluble micronutrient delivery in non-fat products. The most widely consumed nonfat milk product is 0% fat yoghurt, chosen it for this study.

Methods: Yoghurts will be made from 3 milk formulations:

1. Skim milk (0% fat) enriched with 50,000 international units (IU) VD in 150 gr product, in CM.
2. Skim milk with same dosage of VD, emulsified with Tween 80.
3. Placebo: skim milk without added VD. 90 healthy adults, aged 18-65, having passed a medical qualification examination, will be randomly assigned to 3 groups. Following over-night fasting they will each consume a 150 gr yoghurt sample as detailed above, and be requested to fast 2 more hours. Blood will be sampled before yoghurt consumption, and after 1, 7 and 14 days following consumption. Blood-serum level of 25(OH)D (the form of VD used as a status indicator in routine blood tests), by chemiluminescence immunoassay (CMIA).

Expected findings: The bioavailability of VD in CM will not be lower than that in Tween 80, in 0% fat yoghurt.

Significance of the study: With the widespread VD deficiency, decreased fat consumption and rising demand for using only natural ingredients there is great importance in delivery of VD and other fat-soluble micronutrients in protein-based delivery systems, like CM, instead of using synthetic emulsifiers, and it is imperative to assure the bioavailability is not compromised by this dramatic change.

CM solubilize VD and help uniformly distribute it in aqueous products and protect it against heat, oxidation and UV.

Enrollment: 90 estimated patients

Sex: All

Ages: 18 to 65 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

Healthy volunteers . adults aged 18 - 65

Exclusion criteria

Intestinal malabsorption, lactose intolerance, medical illness (e.g. liver disease, kidney disease, or diabetes), hypercalcemia, excessive alcohol use, pregnancy, use of medications known to interfere with vitamin D metabolism e.g. anticonvulsants, barbiturates, or steroids), granulomatous disease, use of vitamin D supplements, potential for significant sun exposure (e.g., travel to a sunny vacation site or use of tanning beds) within the month prior to, or during, the study. -

Trial design

Primary purpose: Prevention

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Double Blind

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90 participants in 3 patient groups, including a placebo group

Skimmilk VD will be emulsified using Tween 80

Active Comparator group

Description:

Skimmilk enriched with VD wherein the VD will be emulsified using Tween 80;

Treatment:

Dietary Supplement: Skimmilk enriched with VD wherein the VD will be emulsified using Tween 80

Placebo: un-enriched skimmilk.

Placebo Comparator group

Description:

Placebo: un-enriched skimmilk.

Treatment:

Dietary Supplement: Placebo: un-enriched skimmilk.

enriched skimmilk with VD

Active Comparator group

Description:

enriched skimmilk with VD

Treatment:

Dietary Supplement: enriched skimmilk with VD